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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371e2b24c70e19d04e856e45328473ee2dc77d85337483ae1812e1f14673f512' 
  AND token = '7sAQTQZbaUlnXZl5He3vbeMm9VCXjOYlW7yXy8J8bIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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