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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2f8465c4c17c8865038b319298cc92231d778c162f4927d8809b74b4202c74' 
  AND token = 'i09u5F5D0vcI7s5Ue9XVp8ABO8ah0ngVWZX8OdqIFDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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