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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9e4e387c7e41c2243892d8c61f2ad088584f417a3eff4cb2e6b77d69c04627' 
  AND token = 'udjilywO1phVhwZF0Xi5CZTq8SqjF5ACWzE912O2F7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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