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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc9f3e75f0e74f795a28b2cb12d7576ded06821f2cdbb55fc1a58be170a2e39' 
  AND token = 'TjhvKOEwhmy73IpIKRv07gYcdYy9cqidrkdyr0As3xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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