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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a0f6a1792679a4149b5ad96c366b56b7f1837c56a15d8d70393235ea49cff0' 
  AND token = 'f22wL7NtIiSh8UjHTiiGN6OhZxAQEzSUu9mnDmqYAZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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