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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dac1274349a103f2b858a6484450022b1c108b20be6b0a3e140ad2a9e3b58e' 
  AND token = 'T4D2JtMl6OODLuU1HM+B/mQLQxRnymHrofhE/mZK90E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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