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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dacd4503a234e77818cb603f5a61e519c16bda6d6853e68a63b49e0648bbfba' 
  AND token = 'soqdgwnLEy4D4mELyzvX2Vg1nm7ColjBVmgWMC0pGW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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