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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd197606cccbf2ff2ebbaf306cacce5ce35698248f712a515519221898de5ec' 
  AND token = 'g2xIpwia+MF3EI6bL7wPzC6AVrx/N4ttvw62TAKm6YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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