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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27d41528d7a1f36b75b261c4834bd77652cce54f995d3e2dfe6361c8ab3ce56' 
  AND token = 'YBwcRwEQU9XwZtEiFBc4K5UggNvfZVS90nmO9grasdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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