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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c493ac8bfcb1e45d3edc160ac6cc0572db7bb9d688cdd7f800839264fdcb96e' 
  AND token = 'rSjQRvHFpqib8c3x7swA2ANwRfNwGls8f3IGfB/nOYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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