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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf7a7b8ff8949bbab955a51c78a4b8a9f38e8f004eac3903a151c29359c6481' 
  AND token = 'xBKYUY8nbP8EnoyDr67sKcQ+H71d5tFoFj9M0u2EIi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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