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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020eb3ed59954ab792764543da03cdf18ebfe6e8b1a86284017e0e50aabdfa7f' 
  AND token = 'OHT61EiONZHO+zfZ1W6fW1GCzxnxbkelK7vO9ojaodQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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