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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102f6d82f1ce2c6f54e63bdc0ac89216f16520ea42ef9f55417c7335686d31ee' 
  AND token = 'j6iVqZGpE0CtSfpazwHvdjzLYPfUWmEZd6XdMRvsJuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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