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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22083c671bdba2bb23fdffd3d2b03b48e96e2efee1d8e9b29e80c0c6f48d9b9e' 
  AND token = 'I3qEzPJAsPEEjiuZPtFOQNKLWL7M8ytW6tnnsQKDmW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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