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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65716c30c49becb2fdcef3405625386e731a1c9b05a7a4081badcfdb2d0b14bc' 
  AND token = 'E3G0tC/hrmE/9iJNeXi6OjImG7tQHI6EvJR/+LmKQKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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