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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a70490987f91af2c2696a98d94aa1e287e53533b892efbd008feebb8c56964' 
  AND token = 'woYI+mA3cCN83DbiLU4pdmsI0O3cTg1TXl9IJzurNQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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