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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d2ea88c790d1a51245cc9fcc621d75d538e90b9873b23957390483276e58f1' 
  AND token = 'fMzU4IPf4Lmmu9nEpT2tg78S0hKisBPstKWsU4Nqt5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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