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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e146d96d4b70d4cd5861663564de36b101ab89b3ea4c4767a48731ae1a3fac' 
  AND token = 'zU5gipe6raufrYTQE7D/D+sIL8dfnv0c4B0pxTngniY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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