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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14de187f0f33b467c2ca351c73c06c16aff7502f5b71d4d757f84fb69e31e9a2' 
  AND token = 'wK+meHgm8Rxjwwj3l0A3q5Mc6IUnsTzHjtesfExpOMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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