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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd01459d9c25a778cc8cf31de89b22974b270e7fb879390e1572bf2fe80e8e52' 
  AND token = '3UOdxPuF/JbLto79nsoDa/+Nh0a8FEtog/Gwu7qdi8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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