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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7322df8f820c8e9bf9f66ac1ae6062f0f56b8d64372529104956da51331cd7' 
  AND token = '6Idi5ODZgon1Pu9T62HTgMONpHsH5FOFy4Ktp7T1RCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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