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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd37784fc7b7ac89d143a18341b6c1a7af89f9296f46f7a8ec195de0bbc4b3a' 
  AND token = '+c6TGP7wGsgEDTIASQDPKaqyxhpEVieFFlUXemkYgrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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