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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2c1f94e49879c286b1f1d385233614ca475ade60a3d18cae0fdc2c80607773' 
  AND token = 'J6zB8aFMeDIeEX0tNNp4jvkSsk3NSYjqPfXR6n0I1fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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