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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32fcc5b40a58629a19bcae7ff978496361f8eb902cb1dbea45c01a1a0faa095' 
  AND token = 'u0zKG4N3yL3i0oiBRldfvctjoONChGpSpvv6+dHSQW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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