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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912b29be5090afc5fd1d7dda65b6bda4e56f9a79fab1dfa60d5027ac21ddce27' 
  AND token = 'nb5bTObVHUrq2pTLu2saru3DHHBgPzW9JPozLqjq0Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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