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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3f8bee06e25185d1445a9bfbe8f217b637157ec8c143514e9cb2e23a0e95b3' 
  AND token = 'wlBPUf0PJE+TQND65biFJqawM8i5NUqAUWkIxT/ACO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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