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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a8b87683412d2bdb2aff541086d749308fa48eab5b6fc31c5595c7f16a87fb' 
  AND token = 'zoNlE4mbl1m8rQnthv3c+TKlIWirf30cn8F/FGtAg+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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