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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abb89541f01ee4883f8a2cd1c26990c2480255ad9a80b48fb379c8750d6d4aa' 
  AND token = 'GUSyf/5me0OkaWK6nEOLxMqGFnX/NDxlR87SwAGp1AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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