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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f50f38a842e84103d67ecc4ed9f6dbba1a478828c475556c08db0ef6bb691ab' 
  AND token = 'z/HifF9NKjkhizFkARkQJaDjcca9uPLdia/eICiG880=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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