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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f4cc887fb652610c58e49de3aa82db24f55c64757cbc58221ed93648f4a0a0' 
  AND token = '67C0NRKc+mdGDZcQhGuC9BZPj1a8yfeKi4QXoTrOIbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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