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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e659e0091ddc578173414b1b29415718b6c2b540f07e0b4b60d5d06943a969' 
  AND token = 'sFxYlDWN3tScqzCOqn6rIfR0jNRoKCUlyfsOi6uyLcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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