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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af86d976a2798520a1feeaf0ee165734b626d448849d2861229b2ab059c2768c' 
  AND token = '6ZyaWxwTZMDzfzrdfv77eG4CNGcftzDEUcl3KS2hxnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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