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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca9ae76ef5f5304306dfa7aa5a8202fb48611d687dc407c5c446e7e65f0e90a' 
  AND token = 'm3hjQ/tRZs0MBfGf5ykWnwE70uN/dcU1mM3pgPyNO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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