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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9985a8d47871a2cd36dbb7bad15ff1a907b5d3eca6b6b4c4991e82bf0049c8' 
  AND token = 'bI8bAxLMX0vlbgI/a86g+ax7IeZETKM9f+s5dc5/oYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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