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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719a651336972e6f8fb9258e0e32d31d0e3ce5290003404c9b0da0c2158000f7' 
  AND token = 'g8x6fnL0SRsqmwiKusFoPHKm8+toPpGTNDwJ5SsentM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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