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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a089386639d70b43f11493cd530a7b9d30d19af9bed5b0565e1837bee57cd4' 
  AND token = '8ZKGLs02C48ZScj5Hd1iHwFMf8M/rg/v1l/bjgCi0co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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