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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056c4a62efb60f3334a47f7f6656067d8749af33dc0c63c499400c23f4715cfa' 
  AND token = 'zZDXuLDYv6Dyxy5iemFHzPN89Rln9M4nYIYvS1ZD3p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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