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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c829b68492dc146313b72df36e1ac6dee3a3ddbb19fbba296c0bfd68831efc7e' 
  AND token = 'joFP2TUotEkvnMCTDraxYjN+kgoaVx8SAT/aL35X/HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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