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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93c7b9646ec742f36cf40ab32e89e655de8319254aa940a011045c6108dca2a' 
  AND token = 'EfR6w3WamDmzeN+c3xieW861FSpS5bGqdiK/nYUHq4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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