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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71336166f8247804d88aa606978313e260657224e859f71544161a49bb880df' 
  AND token = 'uuC83oj8GJGAno5v2EQEgLngj0qfJijfe8Ev4PvMGg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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