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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4aa098cb0c99983e08ed40f394e647edf9b68c5ae9ab67a64fbc6f416bb4ec9' 
  AND token = 'eEtnZZASi/MHFLwEFmnR3DGUVz5Tyaz2q+Ri7/tn2Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}