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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21edb522cc43866ee5bd7ed9cb99a60fa3b2d8aafc981ad1a4bf5ef3ffe1099d' 
  AND token = '+OuaPhBbsq1iNfABqlVFQxTBI4raG1oOffedjEzix6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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