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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a230eb2bd51b3ba0c1b033170743288d5842e1f1d2f95fc9e747ed9f9646b73' 
  AND token = '3qGKzQEQsXrNwRs8YxxU61E12v/tHCEasYO17x0F2PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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