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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52eff6630eb6de1eee85d069245f685b87b6f66ca8627bf9b732294a7497cd0f' 
  AND token = 'Tk1TfnG2pxMVQZkmQimV4nwcav9EaCj1b407V3rsFaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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