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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a032c6e2d7462b59f91b4f18d16210d707200878c0a1633ed99c8eaa20cd5b' 
  AND token = 'yu4n1jyo7PSscpi7eSdYsAcoQvp6NxEBjSLmLj8FwH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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