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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929361929217a131e23aa543a09f3bab3eabbeb5939ba45166d9ed2f7cbd9117' 
  AND token = '1t/Ue6j5Tx5WqODpwG4fxQaEVXzmubi9UprgGmOby88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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