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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4d69a194e8f8685c543161b378418c136cc1ff1fc3ac344eee794f533f5b6e' 
  AND token = 'T4NNQ3i2GlZaMtCtLJ6wbH7SosS5B+9YvlXBhyTfI8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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