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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba4b39eae2af01e0a63195ad2050b84b1531fef0e0d58a89beb3177af7d133e' 
  AND token = 'jjAwLevqHf/c2lfdCPH/Rix1CUrlGxdTs5okYQt67aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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