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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c425be3c22a03aad91cf33cd0b95c010343c14fd7c5ee202fa30a5390cdc02de' 
  AND token = '9SNTBImc5cFDn89YSHAyeHu76aHxM7+KlwIThM2oLn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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