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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725787c4575e4109a3e8140d8537abc9c8a0b7dd15d70a936305e9f4a5a7bc9e' 
  AND token = 'aa5Mx4YKLxtlEZp6+Amzfq1MZbgXPYPv0jN8JFM3hyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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