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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841971a38e2879b5f97de09eacb1b6ea4d449b87a83721a8687f4818ddc5cd67' 
  AND token = 'cnPp+QgYg7EXU0aximsiz5gNEg8GlflKKxoWh9Nr61Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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